Autunite.
This autunite was donated by the mine owner who dug it up: It's a lovely specimen, photographed here under ultraviolet light. You can get samples of this an other radioactive minerals direct from the mine.Source:eBay seller boomologistContributor:Theodore GrayAcquired:25 June, 2005Price: DonatedSize: 1.5"Composition:Ca(UO2)2(PO4)2.10H2O